Agent browser infrastructure
BrowserOS neo vs Browser Harness
Both think the framework is the problem. They disagree about what belongs in its place.
Browser Harness comes from the Browser Use team and removes the abstraction instead of adding to it. It connects an agent straight to Chrome over the DevTools Protocol to navigate, click, type, screenshot and handle files, and it ships an MCP server, so Claude Code, Cursor and anything else that speaks MCP can drive it without writing a second CDP layer.
BrowserOS neo starts from the same complaint and answers it differently. Rather than a thinner layer over your Chrome, it is a separate browser with the parts a harness leaves out: its own profile, tab isolation, a live cockpit and a replay of every run.
The short version
Choose BrowserOS neo when
- You want agent tabs somewhere other than the window you are working in.
- You want to watch a run and scrub back through it.
- Several agents should run at once without you arranging it.
- You want one install rather than a wiring job.
Choose Browser Harness when
- You want the thinnest possible thing between agent and browser.
- You would rather read the source than trust an application.
- Pointing it at a Chrome you launched yourself suits you.
- You already run Browser Use and want the same team’s tooling.
Side by side
| Dimension | BrowserOS neo | Browser Harness |
|---|---|---|
| Shape | BrowserOS neoA browser application. | Browser HarnessA control layer over CDP with no framework under it, plus an MCP server. |
| Which agents work with it | BrowserOS neoAny MCP agent, in a browser of its own. | Browser HarnessAny MCP agent too, through its MCP server, driving the Chrome you point it at. |
| Whose Chrome | BrowserOS neoIts own, beside yours. | Browser HarnessOne you point it at, which is often the Chrome you use yourself. |
| Isolation | BrowserOS neoAgents get their own tabs and cannot touch the ones you have open. | Browser HarnessWhatever the Chrome you attached to already has open. |
| Several at once | BrowserOS neoBuilt in, with a cockpit showing each agent. | Browser HarnessHowever many you arrange yourself. |
| Seeing what happened | BrowserOS neoLive cockpit and a scrubbable replay, on by default. | Browser HarnessLocal recordings exist but are off by default, so the usual record is the agent’s own transcript. |
| Setup | BrowserOS neoInstall, import logins, connect an agent. | Browser HarnessWire it to a Chrome and go. Less to install, more to arrange. |
| Price | BrowserOS neoFree. You bring your own model keys. | Browser HarnessFree, and from the same team as Browser Use. |
The row worth pausing on is isolation, because it is the only real disagreement. Everything else is a question of how much scaffolding you want; this one is whether an agent can reach the tab you are typing in.
A harness you can read end to end is a real answer to that, right up to the moment an agent does the wrong thing quickly. neo answers it with a separate window instead, which holds whether or not anyone read the source.
A small surface is not the same as a safe one.
Browser Harness is easy to audit because there is little of it, and its MCP server means any agent can drive it, which is the same openness neo is built on. What it does not do is keep agents away from your own tabs, because it drives the Chrome you point it at, which is usually the one you are working in.
neo answers that structurally rather than textually. Agents get their own browser and their own tabs, they cannot close the document you are writing, and recording is on by default rather than a setting someone has to remember, so a bad run is visible afterwards rather than inferred.
Auditability and isolation are both security arguments. Only one of them still holds when an agent does the wrong thing quickly, in the window you are using.
Common questions
Who makes Browser Harness?
The Browser Use team, as a deliberately minimal alternative to their own framework.
Is Browser Harness the same as Browser Use?
No. Browser Use is a full framework with its own agent loop. Browser Harness strips that away and connects an agent straight to Chrome over the DevTools Protocol.
Does BrowserOS neo use CDP too?
Underneath, yes, and both expose it over MCP. The difference is not the protocol, it is that neo is a browser with its own profile and tabs rather than a layer over the Chrome you already run.
Which one is safer?
They trade differently. Browser Harness is a small surface you can read end to end; neo keeps agents out of your own window entirely. Pick the risk you would rather hold.
Check it yourself
Every claim about Browser Harness here was read off these pages on 16 September 2026. If something has gone stale, tell us.
What we could not confirm
- We have not run its self-healing behaviour ourselves, where the agent writes missing helpers as it works; that description comes from the project’s own README.
Other comparisons
- vs CometConsumer AI browsers
- vs AtlasConsumer AI browsers
- vs DiaConsumer AI browsers
- vs PlaywrightTest and scripting frameworks
- vs PuppeteerTest and scripting frameworks
- vs SeleniumTest and scripting frameworks
- vs agent-browserAgent browser infrastructure
- vs Browser UseAgent browser infrastructure
- vs BrowserbaseAgent browser infrastructure
- vs StagehandAgent browser infrastructure
- vs Playwright MCPAgent browser infrastructure
- vs Claude for ChromeAn agent inside the browser you have
- vs Codex in ChromeAn agent inside the browser you have
- vs Kimi Browser ExtensionAn agent inside the browser you have
Give your agent a browser it can sign into.
Free, open source, and it sits beside the browser you already use.